Safety device for foot-power punch presses and like machines



I Ill H.1 1. RAYMOND SAFETY DEVICE FOR FOOT POWER PUNCH PRESSES AND LIKEMACHINES Filed June 25, 1927 M1 April 23, 1929.

n l||||| YIIIII'IW are caused to co-act Patented Apr. 23, 1929.

U N I T E D S T A HORACE H. RAYMOND, OF BERLIN,

TES'

CONNECTICUT, ASSIGNO R TO THE STANDARD 1 1,710,383 PATENT orr cs.

SAFETY MFG. CO., INC, OF NEW HAVEN, CONNECTICUT, A CORPORATION.

SAFETY DEVICE FOR FOOT-POWER. PUNCH BRESSES AND LIKE MACHINES.

Application'filed June 23,

This invention relates to an improvement in safety devices forfoot-power punchpresses and like machines, and particularly to safetydevices for preventing the movement of the punch or cutting tool of sucha machine, in the event that the hand of the operator is in the path ofthe tool.

The object of this invention is to produce a simple, reliable andsensitive device of the class described, constructed with particularreference to fewness of parts and lowcost for manufacture.

With this obj ect in view, my invention consists in a safety device forfoot-power punchpresses and like machines, characterized by having astationary locking-bar adapted to be secured to the machine-frame andformed with locking-teeth; a bodily-movable swinging locking-leverpivotally mounted upon the slide of the machine and also formed withlocking-teeth; a guard-supporting rod carried by the said slide, withcapacity for independent reciprocation with respect thereto and a camactuated by the said rod, whereby the teeth of the swinginglocking-lever with the teeth of the stationary bar to positively stopthe descent of the slide when the said guard-supporting rod is preventedfrom descending with the slide.

In the accompanying drawings:

Fig. 1 is a view in frontelevation of the head and slide of apunch-press provided with my improved safety device;

Fig. 2 is a broken vation;

Fig. 3 is a broken plan view thereof;

Fig. 4 is a sectional viewon the line 1-4 of Fig. 1; and I i Fig. 5 is abroken sectional view on the line 55 ofFig. 1. V I

In carrying out my invention as herein shown, I emplo avertically-arranged sta tionary lockingar provided at the opposite endsof'its rear face withtwo rearwardly-projecting integral spacing-lugs 11which bear against the front face of the left-hand side of the head 12of a. punch-press or simi lar machine, to which the bar is secured bymeans ofscrews12 'passing through the said bar and lugs and into thehead 12, as shown in the drawings. Upon its right edge, the locking-bar10 just described is provided with a long vertical. series ofupwardly-facing angular teeth 13 for the purpose as will hereinafterappear.

view thereof in side ele- 1927. Serial No. 200,848.

- The head 12 of the punch-press is of ordinary and well-knownconstruction and carries the usual reclprocating slide 1& which mounts,at its lower end, a punch 15 or other suitable tool. Secured to theforward face of the slide 14. I mount a carrier-plate 16 which isprovided at its opposite ends with two forwardly-projecting guide-lugs17 and 18 which are formed respectively with vertical guidepassages 19and 20 for the guidance of a vertically-arranged reciprocatableguard-supporting rod 21, which latter has capacityfor sliding movementin the said lugs and is provided, at its lower end, with an offsettingguard-ring 22 arranged annularly around the punch 15. The forward faceof the guard-supporting rod 21 is formed with a series of transversegrooves 23, any one of which, as may be required, is adapted to receivethe tapered inner end 2% of a couplingpin 25 mounted in a horizontalbearing-opening 26 in the forward face of a cam-block 27 which is alsoformed with an inclined camface 28, as clearly shown in Fig. 1, andserves to limit the downward movement of the rod 21 by engaging theupper face of the lug 18. At its outer end, the coupling-pinis providedwith a knurled finger-button 29 and midway of its length with an annulargroove 30 into which extends the bifurcated outer end of a bowed spring31, the opposite end of which is secured. to the right-hand end of thecamblock 27 by means of a screw 32.

The coupling-pin'25 just above mentioned serves to couple the cam-block27 with the guard-supporting rod 21 in any one of several positions ofadjustment, so that the camblock, in the normal functioning of thesafety device, virtually constitutes a part of the said 24 ofthecoupling-pin in engagement with one of the said coupling-grooves 23 ofthe guard-supporting rod 21. v The cam-face 28 of the cam-block 27coacts with a cam-surface 33 formed upon one edge of a swinginglocking-lever 3 1 near the lower end thereof and opposite to a series ofdownwardly-pointed angular teeth 35 which are formed upon its left edge,as clearly shown. in Fig. 1. The said locking-lever 34. is mounted forswinging movement upon the enlarged outer end 36 of a stud 87 providedwith a threaded shank 38 passing through a clearance-passage 39 andentering a concenlot 'tric threaded bore 1-0 in the front face of thereciprocating slide 141- aforesaid. The junction of the parts 36 and 38of the stud results in the formation of a rearmirdly-facing shoulder 11.which bears in a shallow recess 42 in the forward face of thecarrier-plate 16, concentric with the clearance-passage 39 therein andin line with the threaded bore 40 in the slide ll. 'lhe stud 37, justmentioned, in conjunction with ascrew .13, serves to attach thecarrier-plate 16 to the slide 1.4L.

At its extreme upper end, the swinging locking-lever 3 1 is providedwith a forwardly and laterally -olfsetting arm 14 mounting a disk-likecounterweight 45 which tends to swing the said lever from left to right,so that its teeth 35 are normally held out of engagement with the teeth13 of the stationary lockingbar 10.

Under ordinary circumstances the slide 14: descends to engage the punch15 of the work and carries with it the carrier-plate 16, together withthe locking-lever 3a, cam-block 27, guard-supporting rod 21 andguard-ring 22. If, however, the hand of the operator has not'beenremoved from the path of the punch 15, the'guard-ring 22 will strike thehand, with the result that its downward movement, together with that ofthe guardsupporting rod 21 and cam-block 27, will be checked. Thecontinued downward move .ment of the locking-lever 34 with the slide 14to which it is attached, will, by virtue of'the engagement of itscamsurface 33'with the cam-face 28 of the cam-block 27, cause the saidlocking-lever to be swung from right to left, so as to engage itsdownwardlyfacing teeth 35 with the upwardly-facing teeth 13 of thestationary locking-bar 10, so that the downward movement of the slide ispositively checked until such time as the hand is re moved from beneaththe guard-ring 22, and the rod 21. and cam-block 27 permitted to descendinto their normal positions with re spect to the locking-lever 34:,whereby the same is permitted, under the urge of its counteiwveight 45,to swing its teeth 35 out of engagement with the teeth 13. VJ'hen thedescent of the rod 21 is checked by the interposition of the operatorshand, as above described, the guide-lugs 17 and 18 slide over the saidrod. The number of teethupon the locking-bar and locking-lever may vary,though, as shown, one of these locking elements is preferably providedwith a larger number than the other, in order "to insure a lockingaction. at any point in the relatively long travel of the slide.

As thus constructed and described, my improved safety device effects thestoppage of the downward movement of the punch 15 or other tool whichthis slide 14 may carry without sensibly affecting the hand of theoperator, since only the downward movement of the relatively-light parts21, 22 and 27 must be stopped by the hand in order to cause the teeth 35to engage the teeth 13 and thus positively check the descent of thepunch.

I claim:

1.. The COHlblDZLtlOIl with the slide and head of a. foot-powerpunch-press or like machine; of a safety device comprising a stationarylocking-bar secured to the front face of the said head and provided inits side-edge with locking-teeth; a swinging locking-lever also providedin its side-edge with locking-teeth and carried by the said slide so asto swing laterally across the front face thereof; means for holding thelocking-teeth. of the said lever outof engagement with the locking-teethof f locking-bar secured to the front face of the said head and providedin its side-edge with lecking-teeth; a swinging locking-lever alsoprovided in its side-edge with locking-teeth and carried by the saidslide so as to-swing laterally across the front face thereof; means forholding the locking-teeth of the said. lever out of engagement with thelocking-teeth of V the said bar; a vertically-n'iovable guardsu'pportingrod also carried by the said slide with capacity for independentmovement with re spect thereto; and a cam co-acting with the said leverand adjustably connected to the said rod; whereby the locking-lever iscaused to swing crosswise of the slide and co-act with the teeth of thestationary bar to positively stop the descent of the slide when the saidguard-supporting rod is prevented from'de scending with the slide.

3. The combination with the slide and'head of a foot-power punch-pressor like machine; of a safety device comprising a stationary locking-barsecured to the front face of the said head and provided withlocking-teeth; a carrier-plate secured to the front face of the saidslide ad. i'acent the said locking-bar; a swinging locking-lever alsoprovided with locking-teeth and pivotally mounted-upon the saidcarrier-plate for movement across the front face thereof; means forholdingthe lockingteeth of the said lever out ofengagement with thelocking-teeth of the said bar; a vertically-movableguard-supporting rodalso carried by the said carrier-plate with capacity for independentmovement with respect thereto; and

the said rod; whereby the loeking-lever'is a cam actuated by caused toswing across the front face of the slide and coact with the teeth of thestation ary bar to positively stop the descent of the slide when thesaid guard-supporting rod is prevented from descending with the slide.

4. The combination with the slide and head of a foot-power punch-pressor like machine;

teeth and pivotally mounted upon the said carrier-plate for movementacross the front face thereof; means for holding the lockingteeth of thesaid lever out of engagement with the locking-teeth of the said bar; aguardsupporting rod reciprocably mounted in the said guide-lugs withcapacity for independent movement with respect to the said carrierplate;and a cam mounted upon the said rod in position between the saidguide-lugs; whereby the locking-lever is caused to swing crosswise ofthe slide and co-act with the teeth of the stationary bar to positivelystop the descent of the slide when the said guard-supporting rod isprevented from descending with the slide.

5. The combination with the slide and head of a foot-power punch-pressor like machine; of a safety device comprising a stationary locking-barsecured to the front face of the said head and provided withlockingteeth; a swinging locking-lever pivotally mounted on the saidslide for movement across the front face thereof and formed on one edgewith locking-teeth and on its 0ppositeedge with a cam-surface; acounterweight laterally offsetting from the said lever in position tonormally urge the lockingteeth of the said lever away from the locking--teeth of the said bar; a vertically-movable guard-supporting rod alsocarried by the said slide with capacity ment with respect thereto; a camcarried by the said rod and co-acting with the cam-surface on the saidlever; whereby the lockinglever is caused to swing crosswise of theslide and co-act with the teeth of the stationary bar to positively stopthe descent of the slide when the said guard-supporting rod is preventedfrom descending with the slide.

6. The combination with the slide and head of a foot-power punch-pressor like machine; of a safety device comprising a stationary locking-barsecured to the front face of the said head and provided withlocking-teeth; a carrier-plate secured to the front face of the saidslideadjacent the said locking-bar; a

for independent move 7 swinging locking-lever pivotally mounted upon thesaid carrier-plate for movement across the front face thereof and formedon one edge with locking-teeth and on its opposite edge with acam-surface; a'counterweight laterally offsetting from the said lever inposition to normally urge the locking-teeth of the said lever away thesaid bar; a vertically-movable guard-sup porting rod also carried by thesaid carrierplate with capacity for independent movement with respectthereto; and a cam carried by the said rod and co -acting with the saidcam-surface; whereby the locking-lever is caused to swing crosswise ofthe said plate and co-act with the teeth of the stationary bar topositively stop the descent of the slide when the said guard-supportingrod is prevented from descending with the slide.

In testimony specification.

HORACE H. RAYMOND.

from the locking-teeth of whereof, I have signed this.

